LogSurfer
OS X and various system components write system logfiles in the /var/log
folder of the OS X system disk. For system administrators, information found
in /var/log is often vital, since severe problems might be identified, as
soon as they appear. Moreover, software- and web-developers often inspect
logfiles to find software bugs and problems.

LogSurfer is a handy application, which constantly monitors logfiles and
prints new messages as soon as they appear. LogSurfer discovers upon its
start-up process all available logfiles and prepares a popup menu to
easily select the file of interest.
LogSurfer Free vs. LogSurfer Pro